I was trembling with nervousness and tingly with strange excitement, which told me our little experiment was already succeeding… even before it had really begun!

I shared the same psychology class with my boyfriend, Aiden. Our professor was always telling us to think outside the box. She was big on gender issues and how people got socialized into accepting certain parameters. It was a tough course.

Early in the semester, we found ourselves with a paper due. Aiden and I had been allowed to pair up for the project. We had to come up with something clever and insightful. The professor had left the topic wide open for the class, which actually made the task harder. But Aiden and I had racked our brains, and we’d come up with a wild idea.

I was in the bathroom, putting on my… well, costume I’d guess you’d say. I had on a tight ribbed tank top which I’d gotten in the men’s section of a clothing store. I’d had to go to a sports place for the other item: a jockstrap. It had a black elastic band that went around the waist and a pouch meant to hold a guy’s junk.

After I slipped it on and turned before my mirror, I saw it left my butt exposed. And of course I didn’t have a cock to fill out of the front. My tits pressed out against the tank top, further divulging my gender.

But the point wasn’t to pretend I was a man. I was wearing male underthings to deliberately juxtapose my femininity with the masculine wear.

The sight of myself in the getup stirred something in me. I liked wearing lingerie, especially when Aiden and I fucked, but this was something totally new for me… which was the point. We would present ourselves to each other in traditionally gender-opposite underwear, then note our reactions. All in the name of science.

While I prepared myself, Aiden was in my bedroom, donning my frilly underthings. I honestly didn’t know how I would respond to the sight of him like that. But I was already transfixed by my transformed image in the full-length bathroom mirror.

I strutted back and forth, grinning at myself. I even murmured, “Hey, boy, you want to come over here and suck my cock?” I giggled at myself. But I realized I was pretty turned on.

Finally, I went to the door and knocked. “Aiden? You ready for me?”

There was a pause. Then in a quavering voice, he said, “Okay, come on in.” I realized he must’ve been nervous, too. I bit my lip in anticipation and opened the door.

Aiden had had the pick of my lingerie. He could have done something half-assed, like put on a pair of my panties and a camisole. I was very athletic, and he had a sleekly muscled build, so we were near enough in body sizes.

But he’d gone all-out. I stepped into the bedroom, and my jaw dropped. I was stunned. My boyfriend was wearing my sexiest bustier. The panties he’d chosen were sheer and snug. But he hadn’t stopped there. He also wore stockings with garters; a garter belt cinched his trim waist.

He was, head to toe, decked out in totally sensual woman’s wear. A smile quivered on his lips. I looked him up and down, unable to get enough.

“What do you think?” he asked shyly.

I remembered… this was an experiment. We had to state our reactions. With absolute honesty, I said, “You look so fucking hot I think I might faint.” Then I added, “How about me?”

He’d been staring just as intensely. His smile grew suddenly more confident. He said, “Fuck, Ronni, you’re making me want to turn full-on gay.”

The panties he’d picked definitely left little to the imagination. His lovely cock was swelling behind the little triangle of gossamer fabric. My nipples were stiff under the ribbed tank top, and my pussy was getting damp.

But the scholar in me remembered we had to ask more questions. “How, uh, does your outfit make you feel?” I asked my lingerie-clad boyfriend.

His face was flushed, and his hard-on looked like it was ready to tear through the panties. “I feel,” he said, “as sexy as all hell. How do you feel dressed like that?”

“I feel like the butchest boy in the world.” Saying the words increased my excitement. Then I blurted out, “If I had a cock right now, I’d fuck your pretty brains out, girl.”

I bit my lip again. Had I gone too far? But Aiden’s face split in a grin. He moved toward me. The rest of the questions could wait. By that point, our reactions were obvious. We could write down our impressions later.

“She came a split second before me, rocking her body atop mine.”

Tugging the lace aside, Aiden pulled his cock out from the panties. He only looked more beautiful to me with his shaft freed, his manhood framed by the garters. I shifted my jockstrap over, exposing my slick, shaved pussy.

My bed was between us, and we leapt on it together. I pulled Aiden into my arms, and our trembling mouths met. We kissed deeply, our tongues moving with electric intensity. We’d always been hot for one another, and sex between us was never anything but great. But we were experiencing something new and special. We were in an unfamiliar place, working without orthodox boundaries. We were still the same people, though, I realized with a tremulous glee. I was female; he was male. Our bodies were the same. But by merely swapping the fabrics and accoutrements with which men and women traditionally adorned themselves, everything had been turned inside out. This was a gender-identification free-for-all!

Still, when I reached down and took Aiden’s cock in my hand, that hard, familiar shaft felt reassuring. He groaned and reached to trace his fingertips along my pussy’s slippery groove, causing a wave of pleasure to ripple within me.

I jerked Aiden’s rod, feeling the pulse of his excitement. He slipped his fingers deeper into me. I was still keenly aware of the jockstrap’s elastic band around my waist. And I heard the hiss of the silky stockings on his legs as he wriggled against me.

Other men might have flaked on this deal. Guys could have backward notions about “manliness.” But then again, none of those losers had ever made it into my bed. Aiden had been understandably nervous about our venture. I’d felt that way, too. But we had gone ahead… and boy, was I happy about that!

I was grinding on the two fingers he had jammed in my pussy as I pumped his cock energetically. Pre-come oozed out onto my fingers, and I wanted to taste it.

Aiden shifted onto his back after receiving a gentle shove from me. I moved down between his legs. His cock stood tall before my face, and I held him by his balls. His stockinged legs were on either side of me. He rubbed them against my shoulders, which had been left exposed by the tank top.

The texture of the fabric thrilled me. I saw where the sexy garters were clipped to the stocking tops. With my head spinning, I lowered my mouth toward his cockhead.

I licked up the drizzle of his pre-come, savoring the flavor which was a promise of the bigger, gushing load to come. I put my lips around his knob, my tongue swirling as his body jerked.

I worked my mouth down his staff, sucking hard and creating a tight suction. I lunged past my gag reflex and drew his cockhead into my throat. He moaned loudly.

Aiden’s taste filled my mouth. Still cradling his balls, I started sucking him in earnest. His silky legs rubbed harder on me as I lifted and dropped my mouth, never letting the seal of my lips break. I relished the throbbing length of him.

But he pulled himself away after a minute, before he could shoot off in my mouth. He reversed our positions and lay down on his belly between my outspread thighs. His face hovered over my pussy, but before he took his first lick of me, I watched him sniff the tugged-aside jockstrap, as if it might smell like cock.

“My climax ripped through me. I came hard against Aiden’s mouth.”

The gesture sent a fresh, bizarrely powerful bolt of lust through me. When I felt the brush of Aiden’s tongue on my pussy lips, I cried out and jerked my hips. I looked down at the unbelievably exciting sight of my boyfriend dressed in my lingerie, eating my pussy with hungry laps of his skilled tongue.

Pleasure was swirling every which way inside me. My world felt upended; I had never before imagined dressing up that way could be so stimulating, not even when I had put on the same lingerie to arouse Aiden.

My climax ripped through me. I came hard against Aiden’s mouth, smearing my juices on his face. He raised his head, panting, his eyes sparkling with the same level of excitement I felt.

I saw he was about to jump me and plunge his cock deep inside my well-licked pussy. But I had a better idea, or at least a fun variation on the basic premise.

Pushing upright, I grabbed his hand and led him hurriedly into the bathroom, where the only mirror in my apartment was. Just a short time ago I’d been anxiously checking myself out in it, wondering how Aiden would look and if this whole underwear experiment wasn’t just a misguided effort. But suddenly, I fucking well knew the truth: It was one of the hottest sexual experiences of my life.

And it was time to truly consummate our experiment. I slapped my hands on the wall on either side of the mirror and thrust my ass out. Aiden stepped in behind me.

For a moment we both froze, gazing at our shared reflection. I was in my masculine getup. Behind me was a man in lacy lingerie. We both looked sexy beyond belief.

Aiden slid his cock into me from behind, reaming me with his steely shaft. My pussy streamed with pleasure as Aiden’s hands closed over my hips, then he started stroking into me. I grunted, meeting each of his thrusts.

My excitement grew. He fucked me harder, drilling me to my deepest depths. All the while, I couldn’t take my eyes off the image of us. Gender norms meant nothing as far as what we wore as human beings. These outfits had only served to arouse the two of us.

When he went into his final frenzy, hammering me beyond all control, orgasmic fury overtook me, as well. I was wailing as Aiden’s come jetted deep inside me.

We wrote our paper and got an “A.” But that wasn’t the last time we dressed up.